char: make misc_deregister a void function

With well over 200+ users of this api, there are a mere 12 users that
actually checked the return value of this function.  And all of them
really didn't do anything with that information as the system or module
was shutting down no matter what.

So stop pretending like it matters, and just return void from
misc_deregister().  If something goes wrong in the call, you will get a
WARNING splat in the syslog so you know how to fix up your driver.
Other than that, there's nothing that can go wrong.

Cc: Alasdair Kergon <agk@redhat.com>
Cc: Neil Brown <neilb@suse.com>
Cc: Oleg Drokin <oleg.drokin@intel.com>
Cc: Andreas Dilger <andreas.dilger@intel.com>
Cc: "Michael S. Tsirkin" <mst@redhat.com>
Cc: Wim Van Sebroeck <wim@iguana.be>
Cc: Christine Caulfield <ccaulfie@redhat.com>
Cc: David Teigland <teigland@redhat.com>
Cc: Mark Fasheh <mfasheh@suse.com>
Acked-by: Joel Becker <jlbec@evilplan.org>
Acked-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Acked-by: Alessandro Zummo <a.zummo@towertech.it>
Acked-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

4 files changed, 6 insertions, 18 deletions

diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c
index cd7ef34d2dce..6bad63379a4c 100644
--- a/fs/btrfs/super.c
+++ b/fs/btrfs/super.c
@@ -2163,8 +2163,7 @@ static int btrfs_interface_init(void)
 
 static void btrfs_interface_exit(void)
 {
-        if (misc_deregister(&btrfs_misc) < 0)
-                printk(KERN_INFO "BTRFS: misc_deregister failed for control device\n");
+        misc_deregister(&btrfs_misc);
 }
 
 static void btrfs_print_info(void)
diff --git a/fs/dlm/plock.c b/fs/dlm/plock.c
index e0ab3a93eeff..5532f097f6da 100644
--- a/fs/dlm/plock.c
+++ b/fs/dlm/plock.c
@@ -509,7 +509,6 @@ int dlm_plock_init(void)
 
 void dlm_plock_exit(void)
 {
-        if (misc_deregister(&plock_dev_misc) < 0)
-                log_print("dlm_plock_exit: misc_deregister failed");
+        misc_deregister(&plock_dev_misc);
 }
 
diff --git a/fs/dlm/user.c b/fs/dlm/user.c
index fb85f32e9eca..75ecc0d3bc85 100644
--- a/fs/dlm/user.c
+++ b/fs/dlm/user.c
@@ -362,18 +362,15 @@ fail:
 
 int dlm_device_deregister(struct dlm_ls *ls)
 {
-        int error;
-
         /* The device is not registered.  This happens when the lockspace
            was never used from userspace, or when device_create_lockspace()
            calls dlm_release_lockspace() after the register fails. */
         if (!ls->ls_device.name)
                 return 0;
 
-        error = misc_deregister(&ls->ls_device);
-        if (!error)
-                kfree(ls->ls_device.name);
-        return error;
+        misc_deregister(&ls->ls_device);
+        kfree(ls->ls_device.name);
+        return 0;
 }
 
 static int device_user_purge(struct dlm_user_proc *proc,
diff --git a/fs/ocfs2/stack_user.c b/fs/ocfs2/stack_user.c
index 2768eb1da2b8..ced70c8139f7 100644
--- a/fs/ocfs2/stack_user.c
+++ b/fs/ocfs2/stack_user.c
@@ -655,14 +655,7 @@ static int ocfs2_control_init(void)
 
 static void ocfs2_control_exit(void)
 {
-        int rc;
-
-        rc = misc_deregister(&ocfs2_control_device);
-        if (rc)
-                printk(KERN_ERR
-                       "ocfs2: Unable to deregister ocfs2_control device "
-                       "(errno %d)\n",
-                       -rc);
+        misc_deregister(&ocfs2_control_device);
 }
 
 static void fsdlm_lock_ast_wrapper(void *astarg)